All articles starting with N

Nubian Mercenaries of Gebelein

The Nubian Mercenaries of Gebelein, also known as the Gebelein Nubians, were Nubian C-Group soldiers in Upper Egypt during the First Intermediate Period, known from archer grave stelae.

Nubian pyramids

Nubian pyramids are the steep, narrow royal tombs of the Kingdom of Kush in Sudan, built from about 720 BC to AD 350 at el Kurru, Nuri, and Meroë; over 200 stand at Meroë alone, taller in number than Egypt's roughly 120 pyramids.

Nubians

Nubians: indigenous people of the Nile valley from Aswan into northern Sudan, with Nobiin and Kenzi-Dongolawi languages, ancient kingdoms Kerma, Napata, Meroe, 1964 High Dam displacement, and current activism.

Nubkheperre Intef

Nubkheperre Intef, also known as Intef Nubkheperre, was an Egyptian king of the Seventeenth Dynasty who reigned at Thebes around 1560 BC, during the Second Intermediate Period.

Nubkhesbed

Nubkhesbed was an ancient Egyptian queen of the Twentieth Dynasty, the Great Royal Wife of Ramesses VI and mother of Pharaoh Ramesses VII, around 1140 BC.

Nubwenet

Nubwenet, also written Nebwenet, was a queen consort of Pepi I of Egypt's 6th Dynasty, buried in a small pyramid beside the king's at South Saqqara.

Oct 20, 2026

NUCB2

NUCB2 (nucleobindin 2, NEFA), human gene at 11p15.1 encoding a 420-aa calcium-binding precursor cleaved into nesfatin-1, an anorexigenic satiety peptide acting leptin-independently via melanocortin signaling.

Nuceria (Alfaterna)

Nuceria (Alfaterna), Oscan Nuvkrinum Alafaternum, ancient Campanian town on the upper Sarnus at modern Nocera; chief town of the Sarnus valley, Samnite ally, later Roman colony Nuceria Constantia.

Nuchal scan

Nuchal scan (nuchal translucency, NT scan): first-trimester ultrasound at 11–14 weeks measuring fluid behind the fetal neck, part of combined Down syndrome screening with β-hCG and PAPP-A; increased NT prompts CVS, amniocentesis, or cfDNA follow-up.

Nucifraga

Nucifraga (nutcrackers) is a corvid bird genus, Brisson 1760, with four species after the 2024 Eurasian split: Northern, Clark's, Southern, and Kashmir Nutcrackers, defined by pine-seed caching, a sublingual seed pouch, and keystone pine seed dispersal.

Nuckelavee

Nuckelavee (knoggelvi, "Devil of the Sea") is the skinless horse-and-rider sea demon of Orkney folklore, recorded by Walter Traill Dennison in 1891, blamed for blight, drought, and the mortasheen horse plague, and repelled by fresh running water.

Nucky Thompson

Nucky Thompson (Enoch Malachi Thompson) is the fictional protagonist of HBO's Boardwalk Empire, played by Steve Buscemi; a corrupt Atlantic City treasurer and bootlegger loosely based on real boss Enoch L. Johnson, killed by Tommy Darmody in the 1931 finale.

Nuclear abundant poly(A) RNA-binding protein Nab2, N-terminal

N-terminal domain of yeast Nab2 (Nab2-N, residues 1-97), a PWI-like five-helix protein-interaction module that binds Mlp1 via Phe73 and Gfd1 via Tyr34 to drive mRNA nuclear export; binds no nucleic acid.

Nuclear and Industrial Safety Agency

The Nuclear and Industrial Safety Agency (原子力安全・保安院, NISA) was the Japanese body regulating nuclear and industrial safety from 2001 until 2012, when the Nuclear Regulation Authority replaced it.

Nuclear and radiation accidents and incidents

Nuclear and radiation accidents and incidents, also called nuclear disasters, are unintended events releasing ionizing radiation, rated by the IAEA's INES scale from incidents to Level 7 accidents.

Nuclear arms race

Nuclear arms race: competition among states to build and improve nuclear arsenals. Began with the 1949 Soviet test, peaked at about 70,300 warheads in 1986, was curbed by SALT, INF, and New START, and resumed after New START expired in 2026.

Nuclear artillery

Nuclear artillery is artillery that fires projectiles with nuclear warheads, giving ground forces a short-range nuclear capability; the United States retired its last shell in 2003.

Oct 20, 2026

Nuclear bag fiber

Nuclear bag fibers are the large intrafusal muscle fibers of the muscle spindle, with nuclei clumped in an equatorial bag; they comprise dynamic bag1 and static bag2 types serving velocity and length sensitivity.

Nuclear binding energy

Nuclear binding energy is the energy required to separate an atomic nucleus into free protons and neutrons, appearing physically as a loss of mass, the mass defect.

Nuclear Blast

Nuclear Blast, also known as Nuclear Blast Records, is a German independent heavy metal record label founded by Markus Staiger in Donzdorf in 1987 and acquired by Believe in 2018.

Nuclear bodies

Nuclear bodies are membraneless, phase-separated compartments in the cell nucleus, including the nucleolus, Cajal bodies, nuclear speckles, paraspeckles, and PML bodies, which concentrate proteins and RNAs for RNA processing, assembly, and gene regulation.

Nuclear chain fiber

Nuclear chain fiber, a small intrafusal muscle fiber of the muscle spindle with nuclei in a single row; supplies most Group II secondary endings, signals static muscle length, and is controlled by static gamma motoneurons.

Nuclear chain reaction

A nuclear chain reaction, or neutron chain reaction, is a self-sustaining sequence of fissions in which released neutrons cause further fissions, the principle behind nuclear reactors and weapons.

Nuclear charge radius

The nuclear charge radius, the root-mean-square measure of the electric charge distribution in an atomic nucleus, reveals shell structure, deformation, and halo configurations along isotope chains.

Nuclear chemistry

Nuclear chemistry is the branch of chemistry that studies nuclei and nuclear reactions using chemical methods, closely allied with radiochemistry and applied to radiopharmaceuticals, isotope production, and radioactive dating.

Nuclear clock

A nuclear clock, also called a nuclear optical clock, is a frequency standard that keeps time using a transition between energy states of an atomic nucleus, demonstrated with thorium-229.

Nuclear criticality safety

Nuclear criticality safety is the prevention of unintended, self-sustaining nuclear chain reactions in fissionable material handled outside reactors, kept impossible by controlling parameters like mass, geometry, and moderation.

Nuclear cross section

A nuclear cross section is a measure of the probability that a nuclear reaction occurs when a particle strikes an atomic nucleus, expressed as an effective area.

Nuclear Damage Compensation and Decommissioning Facilitation Corporation

The Nuclear Damage Compensation and Decommissioning Facilitation Corporation (原子力損害賠償・廃炉等支援機構, NDF) is a Japanese government-backed body providing financial support for nuclear damage compensation and technical support for Fukushima Daiichi decommissioning.